Polymer International, ( ISI ), Volume (59), Year (2010-1) , Pages (1258-1265)

Title : ( Copolymerization of ethylene/α-olefins using bis(2-phenylindenyl)zirconiumdichloride metallocene catalyst: structural study of comonomer distribution )

Authors: S. Mohammad M. Mortazavi , Hassan Arabi , Gholamhossein Zohuri , Saeid Ahmadjo , Mehdi Nekoomanesh , Mostafa Ahmadi ,

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Catalysts have a major role in the polymerization of olefins and exert their influence in three ways: (1) polymerization behaviour, including polymerization activity and kinetics; (2) polymer particle morphology, including bulk density, particle size, particle size distribution and particle shape; and (3) polymer microstructure, including molecular weight regulation, chemical composition distribution and short- and long-chain branching. By tailoring the catalyst structure, such as the creation of abridgeor introducing a substituentonthe ligand, metallocene catalysts can play amajor role in the achievement of desirable properties. Kinetic profiles of the metallocene catalyst used in this study showed decay-type behaviour for copolymerization of ethylene/α-olefins. It was observed that increasing the comonomer ratio in the feedstock affected physical properties such as reducing the melting temperature, crystallinity, density and molecular weight of the copolymers. It was also observed that the heterogeneity of the chemical composition distribution and the physical properties were enhanced as the comonomer molecular weight was increased. In particular, 2-phenyl substitution on the indenyl ring reduced somewhat the melting point of the copolymers. In addition, the copolymer produced using bis(2-phenylindenyl)zirconium dichloride (bis(2-PhInd)ZrCl2) catalyst exhibited a narrower distribution of lamellae (0.3–0.9 nm) than the polymer produced using bisindenylzirconiumdichloride catalyst (0.5–3.6 nm). The results obtained indicate that the bis(2-PhInd)ZrCl2 catalyst showed a good comonomer incorporation ability. The heterogeneity of the chemical composition distribution and the physical properties were influenced by the type of comonomer and type of substituent in the catalyst.

Keywords

metallocene catalyst; copolymerization; copolymer composition distribution; differential scanning calorimetry
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@article{paperid:1017690,
author = {S. Mohammad M. Mortazavi and Hassan Arabi and Zohuri, Gholamhossein and Saeid Ahmadjo and Mehdi Nekoomanesh and Mostafa Ahmadi},
title = {Copolymerization of ethylene/α-olefins using bis(2-phenylindenyl)zirconiumdichloride metallocene catalyst: structural study of comonomer distribution},
journal = {Polymer International},
year = {2010},
volume = {59},
month = {January},
issn = {0959-8103},
pages = {1258--1265},
numpages = {7},
keywords = {metallocene catalyst; copolymerization; copolymer composition distribution; differential scanning calorimetry (DSC); crystallinity},
}

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%0 Journal Article
%T Copolymerization of ethylene/α-olefins using bis(2-phenylindenyl)zirconiumdichloride metallocene catalyst: structural study of comonomer distribution
%A S. Mohammad M. Mortazavi
%A Hassan Arabi
%A Zohuri, Gholamhossein
%A Saeid Ahmadjo
%A Mehdi Nekoomanesh
%A Mostafa Ahmadi
%J Polymer International
%@ 0959-8103
%D 2010

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